NIMS GUIDE TO THE
GASPRA ENCOUNTER

Original: October 1991
Revised: May 1995

Table of Contents

Chapter                                            Page
1.0 Introduction ................................. 1-01
2.0 Encounter Overview ........................... 2-01
3.0 Encounter Geometries ......................... 3-01
4.0 NIMS Sequence Summary ........................ 4.01
5.0 NIMS Detailed Observation Designs ............ 5-01
6.0 Data Return .................................. 6-01
A Appendix ..................................... A-01


Page 1-01

Chapter 1 - Introduction
Contents
Sub-Section                                        Page
1.0 Contents ..................................... 1
1.1 Introduction to the Revised Edition .......... 2
1.2 Original Introduction ........................ 3
1.3 Gaspra General Information ................... 3-5
1.4 Gaspra Ground-based Rotational Phase .......... 6
1.5 Gaspra Ground-based Near-Infrared Spectrum ... 7
1.6 Gaspra Sequence Strategy ..................... 8-9
1.7 Project Science Objectives ................... 10
1.8 NIMS Science Priorities ...................... 11
1.9 NIMS Gaspra Sequence Summary ................. 12-15

Page 1-02

Introduction to the Revised Edition

This document was originally published by the NIMS team in
October 1991 as a guide to the Galileo Encounter with the asteroid
Gaspra. It has been revised and corrected for inclusion on the
Asteroid (5th) CD-ROM of NIMS Experimental Data Records (EDRs).
Some material in the original document has been omitted.
The aim of the revised guide is to provide detailed information
on the various NIMS observations and calibrations. Also included is
background information on the encounter. An overview of the guide
is given below. Please refer to the beginning of each chapter for
a detailed list of contents.

Chapter 1 gives an introduction to the Gaspra encounter as well
as a discussion of various issues that went into the design of the
Gaspra encounter sequence. Chapter 2 gives an overview of the entire
Gaspra encounter using various timelines. Chapter 3 contains digrams
of various aspects of geometry for the Gaspra encounter. Chapter 4
summarizes the NIMS Gaspra observations in terms of a comprehensize
sequence summary, PA summary and Observation Table (OBSTAB).
Chapter 5 is a collection of the Detailed Observation Designs made
up of OAPEL forms and POINTER plots. The Appendix contains a JPL
interoffice memo describing the NAV Team’s OPNAV strategy and a
discussion of error ellipses.

For information on the NIMS instrument, please see the preprint
of the NIMS instrument paper provided elsewhere on the CD-ROM, or
refer to the published version: R.W. Carlson, P.R. Weissman, W.D.
Smythe, J.C. Mahoney and the NIMS Science and Engineering Teams,
"Near-infrared Mapping Spectrometer Experiment on Galileo", Space
Science Reviews 60: 457-502, 1992.
ACKNOWLEDGEMENTS

The NIMS Gaspra observations in this guide were designed by
Cindy Byrne and Paul Weissman with the help of Larry Soderblom, Bill
Smythe and Bob Carlson. The calibrations were designed by Cindy Byrne
with help from Bill Smythe. Cindy Byrne prepared the original printed
guide. Frank Leader subsequently retrieved most of the original
material for the CD-ROM, edited the original Postscript files for
consistency and clarity, recovered missing material by scanning
parts of the original printed document. Some figures from the Galileo
Gaspra Encounter Notebook prepared by the Galileo Mission Design Team
were incorporated into this guide. Al stevenson generated the
sequence summary. Bob Mehlman oversaw the production of this guide.

Page 1-03

Introduction
On October 29, 1991, Galileo will attempt to record the best
spatial and spectral information yet available on an asteroid.
951 Gaspra will serve as the target body and will provide the
opportunity for the first ever spacecraft flyby of an asteroid.
This packet is provided as a NIMS guide to the Galileo Gaspra
Encounter. In the following pages, you will find some information
on the asteroid itself as well as mention of some questions regarding
this body which still remain; the solutions to which won’t be known
until after playback of the recorded sequence in late 1992. Until
then, we provide only the plans for obtaining this data on October
29, 1991. There are many critical activities occuring before Gaspra
Closest Approach which will affect the quality of the planned
observations -- OPNAV frames to be returned, spacecraft attitude
adjustments to be made, a ’tweak’, etc. Each of these activities
are described in the following pages.

951 Gaspra - The Asteroid

Gaspra was discovered on August 30, 1916 by G. Neujmin and was
named after a Crimean resort for scientists. It is a faint object to
Earth-based telescopes and little Gaspra data were gathered until it
became a potential Galileo flyby target. The most recent information
is available in an article authored by Goldader, Tholen, Cruikshank
and Hartmann and planned for publication in the October 1991 issue of
"The Astronomical Journal".

Gaspra is an S-type asteroid, one of the most common types of
asteroids found at its 2.2 AU range from the Sun. S-types have
moderate albedos and moderate to strong absorption features shortward
of 0.7 microns and moderate to non-existent absorption features
beyond 0.7 microns. Gaspra, like most S-type asteroids, is expected
to have a slightly reddish color and to be composed of a combination
of olivine and pyroxene silicates and nickel-iron metal, although in
unknown ratios. Goldader etal. suspect that Gaspra has a high
olivine/pyroxene ratio which may indicate it originated in the lower
mantle of a differentiated parent body. Gaspra is similar to 8 Flora
and 15 Eunomia. With data from the Gaspra Flyby, NIMS will have the
opportunity to further elucidate the nature of S-type asteroids, one
of the most controversial issues in asteroid science.

Gaspra is known to have a non-spherical shape which, for planning
purposes, has been assumed to be a tri-axial ellipsoid with axes given
below. On the following two pages, you will find more information on
Gaspra’s physical constants, some of which have been updated with
information in the publication previously mentioned. Also included
are figures from the paper "Galileo Support Observations of Asteroid
951 Gaspra", which show ground-based observations of the variation in
brightness of Gaspra as a function of rotational phase and also a plot
of the ground-based near-infrared normalized spectral reflectance
(with the expected NIMS spectral resolution noted).

Page 1-04

JET PROPULSION LABORATORY INTEROFFICE MEMORANDUM
GLL-MDT-89-230.IOM
December 13, 1990
Revision C: October 23, 1991
To: Distibution
From: Bruce McLaughlin
Subject: Physical Constants for Asteroid 951 Gaspra (UPDATE)
Concurrence: J.Ludwinski J.Dunne
MDT Chief S & MD Manager

To ensure Project-wide consistency in planning for the upcoming
Galileo encounter with the asteroid Gaspra (currenly targeted to occur
on Oct 29, 1991, 91-302/22:38 SCET - Ephemeris Time), the following
data shall be used by all Project elements involved in developing
planning and sequencing products based upon the physical properties
of Gaspra. These data are the best estimates to date of the known
constants for the asteroid. Gaspra is not a very well studied body
to date, and the uncertainties can be quite large, as shown below.
These data were presented and discussed at the Gaspra Aim-Point
Selection Meeting held on Dec. 6, 1990 and are summarized along with
historical data in a fact sheet compiled by Clark R. Chapman for the
Galileo Project.

UPDATE: Due to misunderstandings and abiguities in the presentation
of the original data, this update has been prepared. It has been
coordinated with the Galileo Navigation Team, the Galileo Science Data
Team, the Galileo POINTER Design Team and Dr. Alan Harris, JPL Gaspra
Observational Astronomer. The key issues of the definitions of the
epoch and prime meridian have been ’rephrased’ to remove the verbal
ambiguity and couched in terms of appropriate coordinate systems and
absolute epochs. In addition, observations taken earlier this year
provide revised estimates of some of the quantities. Clark Chapman
and Alan Harris have provided these updates in a memo and unpublished
E-mail which are available on request for use within Galileo Project
only. These data are not for publication.

Change Control:

The coordination of updates to these values shall be the
responsibility of the Mission Design Team to assure that timely and
consistent values are used at each step of the planning process.
Additional data taken by ground observers early in 1991 may be used
to update these values and are included in the Update. Comments,
corrections or updates to any of these values which occur with the
passage of time should be addressed to myself or to the MDT Chief.

Page 1-05

GLL-MDT-89-230.IOM/Rev. C
Asteroid 951 Gaspra - Physical Constants
Diameter: 12.5 km (range 8-20 km)
Shape: assume tri-axial ellipsoidal with axis ratios
a:b:c = 1.6 : 1.0 : 0.9
+/- 0.3 0.3 0.3
coupled with the assumed mean diameter yields:
a:b:c = 18 km : 11 km : 10 km
(12.5 km = cube root of (a*b*c))
Period: 7.0421 +/- 0.0001 hr (sidereal)
Sense of Rotation:
unknown, but for reference assume prograde
i.e., right-hand-rule about the c-axis (short axis)
North Pole Position:
assume 20 degrees ecliptic longitude, 20 degrees ecliptic
latitude (uncertainty +/1 10 degrees in each direction)
(RA ~ 10.2 deg, Dec ~ +26.2 deg)
Epoch: adopt primary maximum (a-axis perpendicular to the vector
between Gaspra and the spacecraft) occurs at 91-302/19:52
SCET. Maximum will occur at 91-302/21:38 SCET. This
implies W0 = 251.924 deg and W-dot = 1226.906747 deg per
ephemeris day (wrt EME50). W0 has an inherent ambiguity
of 180 degrees, and this particular value is chosen
arbitrarily.
Albedo: 0.20 (range 0.16 - 0.28)
Magnitudes:
H = 11.65 +/- 0.05
G = 0.24 +/- 0.01
B(1,0) = 12.9 (absolute magnitude prior to adoption of
H/G system)
U-B = 0.55
B-V = 0.87
Revised Orbital Elements:
Updated merged ephemeris files in LGFIO and NAVIO format are
available on Unisys tape as described in IOM 314.6-1332,
Updated Orbit and Ephemeris for Asteroid 951 Gaspra,
D.K. Yeomans and M.S. Keesey to W.E. Kirhofer.
The osculating orbital elements (refered to EME50)
presented there are:
Epoch 1991 Dec. 10.0 TDT
T 1992 July 19.52985
q 1.8254967 AU
e 0.1738608
w 129.12909 deg.
Node 252.65713 deg.
I 4.09891 deg.

Pages 1-06 to 1-07

Page figures are found in nimsgd1-06.pdf

Page 1-08

History of Gaspra Sequence: HGA to LGA
The original Gaspra sequence assumed use of the High Gain
Antenna and a dayside, 1900 km closest approach, 60 degrees north
of the ecliptic plane. On April 11, 1991, the Galileo High Gain
Antenna failed to deploy and the sequence plan was changed to include
tape recorded observations that could be played back at a later time
at lower data rates with the Low Gain Antenna. The resulting sequence
is now know as EE3 prime (EE3p). One of the drawbacks to the new
sequence is that fewer OP NAV pictures can be taken and played back
in time (see Appendix A for a description of OP NAV stratagies and a
discussion of error ellipses). This caused the error ellipses to grow
considerably and greatly reduced the probabilities of capturing Gaspra
at Closest Approach. The ’time-of-flight’ axis was much larger than
the semi-major of semi-minor axis of the tri-axial error ellipsoid.
As a result, it has been necessary to move the SSI and NIMS science
observations back in time to allow an ’end-on’ approach of the error
ellipse.
The ultimate sequence became a darkside approach at 1600 km which
met the SSI requirements of high (> 45 degrees) phase angles while
Gaspra filled the largest number of pixels possible in the SSI field
of view. A diagram of the phase angle (Sun-Gaspra-Spacecraft Angle)
with respect to time is plotted in the Geometry Section of this guide.
These high phase angles (over 45 degrees) introduce shadows on the
object, which is less desirable for spectral instruments such as NIMS.
Spacecraft Orientation and Trajectory
Two obvious gains to the change to the Low Gain Antenna sequence
were: 1) Galileo would be pointed Sun-pointed (the High Gain Antenna
requires Earth-pointing withing 1.0 degrees) and 2) the spacecraft
trajectory could nearly lie in the ecliptic plane. The first of these
benefits allowed science observations outside of the spacecraft cone
pole region where pointing stability is lessened. It also created an
opportunity for a NIMS photometric calibration.
The second benefit mentioned above permitted science observations
to be performed with almost pure cone slews, taking out the cross-cone
movement which can complicate NIMS data analysis. A plot of Gaspra’s
and Galileo’s trajectories from a sun-centerd north ecliptic pole view
is presented in the Geometry Section of this guide.
Galileo off-sun angle: 3 degrees (approx)
Radial Distance: 1600 km @ Closest Approach (Darkside)
Closest Approach point: 3.9 deg north ecliptic latitude
Encounter Time: October 29, 1991, DOY 91-302
22:37:00.702 UTC

Page 1-09

The OPNAV Strategy and Error Ellipse Determination
Spacecraft position and velocity is well known using radio
signatures from the spacecraft. This is not the case for Gaspra’s
trajectory. As a result, science observations must take into account
a region of uncertainty in the position of Gaspra relative to the
spacecraft. The resultant ’error ellipse’ is a locus of possible
Gaspra centers and is fixed in RA/Dec space using the most recent
OPNAV information. Determination of the error ellipse size is
described in greater detail in Appendix A. For planning purposes,
’Case 1, ON2’ of that memo has been assumed.

It is critical that these OPNAV frames be returned and processed
in time, particularly the last frame. This last frame will be used to
update only the closest approach observations from 4 hours before
Closest Aproach to a few minutes after Closest Approach. The process
of updating parameters such as RA/Dec of Gaspra’s position and scan
platform slew rates which account for this new position is known as
the ’tweak’.

Due to concern over lack of dual DSN coverage for this tweak
activity, the Galileo Project has decided that those observations from
-4 hours to -1 hours will be tweaked using realtime commands on an
as-needed basis. These observations do not use Target Motion
Compensation (TMC). This strategy allows postponement of the tweak
window to Closest Approach - 1 hour (C/A - 1hr) when dual DSN coverage
is available. Therefore, the remaining observations, all of which
use TMC, occuring from Closest Approach - 1 hour to Closest Approach
will be tweaked at Closest Approach - 1 hour. The NAV schedule for
the Tweak is presented in the Overview section of this guide. The
Science and Mission Design Office will utilize NAV inputs to determine
new probabilities of Gaspra capture. These probabilities will be
reported to the Project which will then give a go/no-go decision for
realtime commanding.

Originally, all science teams were directed to design to a 92%,
or 2.24 sigma, error ellipse. However, since return of the latest
OPNAVS 1,3 and 4, the size of the error ellipse has drastically
diminished. Currently, B . R = 48.3 km and B . T - 26.3 km (1 sigma).
As a result, our probabilities of Gaspra capture have increased.
The NIMS designs given in a later section are designed to cover
an error ellipse which includes the OPNAV information of Gaspra
position uncertainty, the relative size of Gaspra and a possible scan
platform error. The error ellipses appear to be ’dirigibles’ if
observed end-on, which is indeed the observation perspective of NIMS
since the time of flight error is into the paper and in the direction
of spacecraft motion. Due to limitations of the planning tools, we
were unable to provide the actual orientation and shape of the error
ellipse from the end-on perspective. Thus, what appears to be a
circular ellipse is a tri-axial ellipsoid.

Science Priorities
The Asteroid Working Group decided on the science priorities at
Gaspra, as given by the following viewgraph:

Page 1-10

SCIENCE OBJECTIVES
Characterization of Global Properties
o Accurate Size/Shape
o Rotation Period
o Pole Orientation
o Cratering Statisitics
Characterization of Compositional Properties
o Surface Composition (minerals, metals etc.)
Global properties
Heterogeneities
Stratigraphy in craters
Characterization of Surface Morphology
o Morphology of craters as a function of diameter
Characterization of Regolith Properties
o Stratigraphy
o Photometric properties
o Polarimetric properties
o Radiometric/thermophysical properties
Asteroid Environment
o Outgassing from asteroid
o Dust concentrations and radial gradient
o Search for close debris
Hopefull this will provide data for Comparative Processes with
o Other asteroids
o Phobos/Deimos
o Other small planetary satellites

DB-13,14
14 June 91

Page 1-11

NIMS Science Priorities

Using the Asteroid Working Group’s Science Objectives, and
information on Gaspra’s size and spacecraft range, the NIMS Gaspra
observations were sequenced according to the following priorities.
They have been updated to reflect a small increase in tape resource
discovered during the final tape useage estimates. In particular, we
were able to add Fixed Map Observations (XM) to give rotational phase
sampling every 15 degrees.
("Start" and "End" times are in Rims before Gaspra Closest Approach.)
Priority Start End Observation

______________________________________________________________________
1 -23 -8 XM, 0.75 mrad/sec, 2 coverages of error
ellipse for spatial resolution/phase
angle trade-off

2 Broken intervals SM, 0.11 mrad/sec, Low(er) phase,
between multicolor
-48 -24

3 -8hrs -61 FM, 0.03 mrad/sec, every 90 degrees
of Gaspra rotation, with a fifth FM
verifying the first.

SM, 0.11 mrad/sec, 30 degrees samples
XM, 0.75 mrad/sec, 15 degree samples
4 After Closest PCT Calibration - 2 Rims
Approach RCT Calibration - 2 Rims
__________________________________________________

Page 1-12

The NIMS Sequence
The following timeline shows the NIMS, SSI, UVS and PPR science
observations after incorporating the above NIMS priorities with the
priorities of the other teams. The description of each NIMS observation
is located in the ’OAPEL Description’ section which provides
actual time of observation, observation objective and design detail.
You will notice a "+", "-" or "*" after each Activity ID. These
symbols stand for the following, respectively: 1 of 2 or more similar
observations; not a joint observation; a joint observation.
The NIMS Gaspra sequence uses four NIMS modes for science observations:
Long Map (LM), Full Map (FM), Short Map (SM) and Fixed Map
(XM). The sequence also includes the first use of 2 special sequences
(RAM modes) which allow the instrument to toggle between two different
modes in one Rim. Further details on the special sequences can be
found in the information on the OAPELs GASVIS01 and GASNAP01.
In every case, the following grating offsets are used to allow
sampling of the 1.05 micron absorption band. The 1.05 micron samples
maximize the scene contrast and should provide the best information
on the olivine/pyroxene band.
Mode Grating Start Position
Long Map 0
Full Map 0
Short Map 2
Fixed Map 6

Page 1-13 to 1-14

Page 1-13 to 1-14 figures are found in nimsgd1-13.pdf

Page 1-15

NIMS Gaspra Activity Plan Time Ordered Listing
Gaspra Closest Approach (GCA) - 91-302/22:37:00.702 (UTC)
15:37:00.702 (PDT)
Observation Start Time (PDT) Start Time (UTC) Duration Gain
______________________________________________________________________
Full Map- GASPEC01 91-302/07:37:44 91-302/14:37:44 0:03:17 4
Fixed Map- GASPER01 /07:52:01 /14:52:01 0:00:26 4
Fixed Map- GASCUR01 /08:09:12 /15:09:12 0:01:22 4
Short Map- GASPER02 /08:27:24 /15:27:24 0:00:24 4
Fixed Map- GASCUR02 /08:44:35 /15:44:35 0:01:22 4
Short Map- GASPER03 /09:02:48 /16:02:48 0:00:24 4
Fixed Map- GASPEC02 /09:23:58 /16:23:58 0:03:41 4
Full Map- GASPER04 /09:38:11 /16:38:11 0:00:20 4
Fixed Map- GASCUR03 /09:55:22 /16:55:22 0:01:35 4
Short Map- GASPER05 /10:33:34 /17:33:34 0:00:20 4
Fixed Map- GASCUR04 /10:30:45 /17:30:45 0:01:35 4
Short Map- GASPER06 /10:48:58 /17:48:58 0:00:20 4
Full Map- GASPEC03 /11:10:12 /18:10:12 0:04:05 4
Fixed Map- GASPER07 /11:24:21 /18:24:21 0:00:18 4
Short Map- GASCUR05 /11:41:32 /18:41:32 0:01:32 4
Fixed Map- GASPER08 /11:59:44 /18:59:44 0:00:18 4
Short Map- GASCUR06 /12:16:55 /19:16:55 0:01:14 4
Full Map- GASPEC04 /12:56:22 /19:56:22 0:04:20 4
Fixed Map- GASPER10 /13:10:31 /20:10:31 0:00:18 4
Short Map- GASCUR07 /13:27:42 /20:27:42 0:01:63 4
Fixed Map- GASPER11 /13:45:50 /20:45:50 0:00:16 4
Short Map- GASCUR08 /14:03:01 /21:03:01 0:01:69 3
Fixed Map- GASPER12 /14:15:10 /21:15:10 0:00:16 3
Full Map- GASPEC05 /14:31:24 /21:31:24 0:04:83 1
LM/FM- GASVIS01 /14:37:52 /21:37:52 0:04:00 1
Full Map- GASPEC06 /14:44:10 /21:44:10 0:03:38 1
Fixed Map- GASVIS02 /14:51:35 /21:51:35 0:02:46 1
Short Map- GSCHEM02 /14:54:28 /21:54:28 0:05:82 1
LM/FM- GASNAP01 /15:01:07 /22:01:07 0:06:00 1
Short Map- GSCHEM04 /15:07:12 /22:07:12 0:08:29 1
Fixed Map- GASMAP01 /15:16:30 /22:16:30 0:03:67 1
Fixed Map- GASPAT01 /15:20:55 /22:20:55 0:03:00 1
(HIPHAS01)
PCT CAL /18:35:58 91-303/01:35:58 0:02:00 1
RCT CAL /23:50:26 /06:50:26 0:20:00 1
NIMS Turn Off 91-303/18:35:58 /08:58:50
______________________________________________________________________


Page 2-01

Chapter 2 - Encounter Overview
Contents
Sub-Section                                        Page
2.0 Contents ..................................... 1
2.1 Introduction to Chapter 2 .................... 2
2.2 EE2’ Overview, Part 1 ........................ 3
2.3 EE2’ Overview, Part 2 ........................ 4
2.4 Gaspra Sequence Tweak Timeline ............... 5
2.5 EE3’ Overview ................................ 6
2.6 Gaspra Flyby Timeline ........................ 7
2.7 Galileo Gaspra Key Events Timeline ........... 8

Page 2-02

Introduction to Chapter 2

This chapter gives an overview of the entire Gaspra Encounter.
The first two timelines on pages 3 and 4, the EE2’ Overview -
Parts 1 and 2, show the activities leading up to the Gaspra Encounter,
the most important activity being the replay of the OPNAV images of
Gaspra

The timeline on page 5 shows the various activities involved in
the processing of the final OPNAV 5 image of Gaspra leading up to the
decision of go/no-go on the final ’tweak’ .
The timeline on page 6, the EE3’ Overview, shows the various
activities occuring near Gaspra Closest Approach (GCA).
The timeline on page 7, the Gaspra Flyby Timeline, shows a
closeup of the activities occuring right around Gaspra Closest
Approach (GCA).

The timeline on page 8, the Galileo Gaspra Key Events Timeline,
shows the science activities occuring during the Gaspra Encounter,
with graphical representations of the major Gaspra mosaics.

Page 2-03 to 2-08

Page 2-03 to 2-08 figures are contained in file nimsgd2-03.pdf.

Page 3-01

Chapter 3 - Encounter Geometries
Contents
Sub-Section                                        Page
3.0 Contents ..................................... 1
3.1 Introduction to Chapter 3 .................... 2
3.2 Galileo VEEGA Trajectory ..................... 3
3.3 Navigating to Gaspra ......................... 4
3.4 Galileo at Asteroid Gaspra ................... 5
3.5 Trajectory Pole View ......................... 6
3.6 Gaspra Phase Angles .......................... 7

Page 3-02

Introduction to Chapter 3

This chapter contains diagrams of various aspects of geometry for
the Gaspra Encounter.
The figure on page 3 shows the entire Galileo VEEGA Trajectory
from launch through Jupiter arrival with various ’milestones’ labeled
along the trajectory.
The figure on page 4 shows the geometry of the 5 OPNAV images
taken on approach to Gaspra.
The figure on page 5 is a cartoon of the geometry of the Galileo
Flyby of Gaspra.
The figure on page 6 is a Pole View of the Trajectory of Galileo
during the Gaspra Flyby produced by the Galileo NAV Team.
The figure on page 7 is a plot of Phase Angle (Sun-Gaspra-S/C)
as a function of time during the Gaspra Flyby.

Pages 3-03 to 3-07

Figures for pages 3-03 to 3-07 are in file nimsgd3-03.pdf.


Page 4-01

Chapter 4 - NIMS Observation Summaries

Contents
Sub-Section                                        Page
4.0 Contents ..................................... 1
4.1 Introduction to Chapter 4 .................... 2
4.2 NIMS Sequence Summary ........................ 3-25
4.3 NIMS PA Summary .............................. 26-30
4.4 NIMS OBSTAB .................................. 31-32

Page 4-02

Introduction to Chapter 4

This chapter summarizes the NIMS Gaspra observations in terms of
a comprehensive sequence summary, PA summary and Observation Table
(OBSTAB).
The NIMS Sequence Summary is a time-ordered listing of all spacecraft
activity pertinent to NIMS operations for the EE3 Sequence. The
information in this summary is derived from the EE3 SEF (Spacecraft
Event File) with inputs from the NIMS Science Coordinators regarding
the start time and duration of the NIMS observations. There are ten
columns of information in this table:
1) YR - Year
2) DOY - Day of Year.
3) Time - SCET Time (UTC).
4) PSID - Parameter Set ID of the SEF line.
5) Command - Command name from the SEF.
6) Parameters - Parameters from the above Command Line.
7) Description - Description of the above Command for NIMS.
8) GCM - NIMS Gain, Chopper mode, Instrument Mode.
Gain = 1,2,3 or 4.
Chopper Mode = R (Reference) or 6 (63Hz).
Instrement Mode = 0-15
9) O S - Grating Offset.
10) RIM - SCLK of the Command Line (RIM:MF:RTI)
Also, an additional line is inserted into this table at the start and
stop times of each NIMS Observation (Oapel) to bracket the commands
which affect each NIMS Observation.
The NIMS PA Summary is a time-ordered listing of all PAs (Profile
Activities) listed in the EE3 SEF which affect NIMS observations.
The NIMS Observation Table (OBSTAB) is a time-ordered listing of
the NIMS obsrvation parameters for use by downlink data processing.
It is also derived from the EE3 SEF.

Page 4-03


Page 4-04 to 4-25

Pages contains table found in file nimsgd4-04.pdf.

Page 4-26

PA Summary Table
This summary is a listing of the PAs (Profile Activities) used by NIMS
during the Gaspra Encounter.
INPUT FILE: GASPRA_911008.SEF
OAPEL        PA     SID    SCLK1        SCLK2       SCET1         TARGET
--------------------------------------------------------------------------
GAPSLTCRVC01 TARGET 165IG 01072711:89 01072716:14 91-302/14:29:41 GASPRA
GAPSLTCRVC01 INITRS 128IE 01072714:84 01072716:86 91-302/14:32:40 GASPRA
GAPSLTCRVC01 SSI 147IG 01072715:76 01072716:86 91-302/14:33:35 GASPRA
GAPSLTCRVC01 SCIREC 175IQ 01072715:84 01072716:18 91-302/14:33:40 GASPRA
GAPSLTCRVC01 SCITLM 176IQ 01072716:00 01072716:13 91-302/14:33:45 GASPRA
GAPNGASPEC01 TARGET 165JA 01072719:56 01072720:06 91-302/14:37:24 GASPRA
GAPNGASPEC01 CSMOS 117JA 01072719:83 01072723:23 91-302/14:37:42 GASPRA
GAPNGASPEC01 SCIREC 175JK 01072719:85 01072723:25 91-302/14:37:44 GASPRA
GAPNGASPEC01 SCITLM 176JK 01072720:00 01072720:13 91-302/14:37:48 GASPRA
GAPNGASPER01 TARGET 165JB 01072732:04 01072734:06 91-302/14:49:58 GASPRA
GAPNGASPER01 CSMOS 117JB 01072733:83 01072734:22 91-302/14:51:52 GASPRA
GAPNGASPER01 INITRS 128JB 01072733:84 01072734:86 91-302/14:51:52 GASPRA
GAPNGASPER01 SCIREC 175JW 01072734:00 01072734:24 91-302/14:51:57 GASPRA
GAPNGASPER01 SCITLM 176JW 01072734:00 01072734:13 91-302/14:51:57 GASPRA
GAPSLTCRVB01 TARGET 165EA 01072748:89 01072751:00 91-302/15:07:06 GASPRA
GAPSLTCRVB01 INITRS 128EA 01072749:89 01072751:86 91-302/15:08:06 GASPRA
GAPSLTCRVB01 SSI 147EA 01072750:76 01072751:44 91-302/15:08:58 GASPRA
GAPSLTCRVB01 CSMOS 117EA 01072750:77 01072752:29 91-302/15:08:59 GASPRA
GAPSLTCRVB01 SCIREC 175IP 01072750:90 01072751:48 91-302/15:09:08 GASPRA
GAPSLTCRVB01 SCITLM 176IP 01072751:00 01072751:13 91-302/15:09:08 GASPRA
GAPSLTCRVB01 SCIREC 175IS 01072751:52 01072752:31 91-302/15:09:43 GASPRA
GAPSLTCRVB01 SCITLM 176IR 01072751:52 01072751:65 91-302/15:09:43 GASPRA
GAPNGASPER02 TARGET 165JC 01072767:04 01072769:06 91-302/15:25:22 GASPRA
GAPNGASPER02 CSMOS 117JC 01072768:83 01072769:22 91-302/15:27:15 GASPRA
GAPNGASPER02 INITRS 128JC 01072768:84 01072769:86 91-302/15:27:16 GASPRA
GAPNGASPER02 SCIREC 175JV 01072769:00 01072769:24 91-302/15:27:20 GASPRA
GAPNGASPER02 SCITLM 176JV 01072769:00 01072769:13 91-302/15:27:20 GASPRA
GAPSLTCRVB02 TARGET 165EB 01072783:89 01072786:00 91-302/15:42:29 GASPRA
GAPSLTCRVB02 INITRS 128EB 01072784:89 01072786:86 91-302/15:43:30 GASPRA
GAPSLTCRVB02 SSI 147EB 01072785:76 01072786:44 91-302/15:44:22 GASPRA
GAPSLTCRVB02 CSMOS 117EB 01072785:77 01072787:36 91-302/15:44:22 GASPRA
GAPSLTCRVB02 SCIREC 175IO 01072785:90 01072786:48 91-302/15:44:31 GASPRA
GAPSLTCRVB02 SCITLM 176IO 01072786:00 01072786:13 91-302/15:44:32 GASPRA
GAPSLTCRVB02 SCIREC 175IT 01072786:52 01072787:38 91-302/15:45:06 GASPRA
GAPSLTCRVB02 SCITLM 176IS 01072786:52 01072786:65 91-302/15:45:06 GASPRA
GAPNGASPER03 TARGET 165JD 01072802:04 01072804:06 91-302/16:00:45 GASPRA
GAPNGASPER03 CSMOS 117JD 01072803:83 01072804:22 91-302/16:02:38 GASPRA
GAPNGASPER03 INITRS 128JD 01072803:84 01072804:86 91-302/16:02:39 GASPRA
GAPNGASPER03 SCIREC 175JU 01072804:00 01072804:24 91-302/16:02:44 GASPRA
GAPNGASPER03 SCITLM 176JU 01072804:00 01072804:13 91-302/16:02:44 GASPRA
--------------------------------------------------------------------------

Page 4-27

OAPEL         PA     PSID   SCLK1       SCLK2       SCET1         TARGET
--------------------------------------------------------------------------
GAPSLTCRVC02 TARGET 165IF 01072816:89 01072834:77 91-302/16:15:51 GASPRA
GAPSLTCRVC02 INITRS 128ID 01072819:90 01072821:86 91-302/16:18:54 GASPRA
GAPSLTCRVC02 SSI 147IF 01072820:76 01072821:86 91-302/16:19:45 GASPRA
GAPSLTCRVC02 SCIREC 175IN 01072820:84 01072821:18 91-302/16:19:50 GASPRA
GAPSLTCRVC02 SCITLM 176IN 01072821:00 01072821:13 91-302/16:19:55 GASPRA
GAPNGASPEC02 TARGET 165JE 01072824:56 01072825:06 91-302/16:23:34 GASPRA
GAPNGASPEC02 CSMOS 117JE 01072824:83 01072828:47 91-302/16:23:52 GASPRA
GAPNGASPEC02 SCIREC 175JJ 01072825:00 01072828:49 91-302/16:23:58 GASPRA
GAPNGASPEC02 SCITLM 176JJ 01072825:00 01072825:13 91-302/16:23:58 GASPRA
GAPNGASPER04 TARGET 165JF 01072837:04 01072839:06 91-302/16:36:08 GASPRA
GAPNGASPER04 CSMOS 117JF 01072838:83 01072839:24 91-302/16:38:02 GASPRA
GAPNGASPER04 INITRS 128JF 01072838:84 01072839:86 91-302/16:38:02 GASPRA
GAPNGASPER04 SCIREC 175JT 01072839:00 01072839:26 91-302/16:38:07 GASPRA
GAPNGASPER04 SCITLM 176JT 01072839:00 01072839:13 91-302/16:38:07 GASPRA
GAPSLTCRVB03 TARGET 165EC 01072853:89 01072856:00 91-302/16:53:16 GASPRA
GAPSLTCRVB03 INITRS 128EC 01072854:89 01072856:86 91-302/16:54:16 GASPRA
GAPSLTCRVB03 SSI 147EC 01072855:76 01072856:44 91-302/16:55:08 GASPRA
GAPSLTCRVB03 CSMOS 117EC 01072855:77 01072857:35 91-302/16:55:09 GASPRA
GAPSLTCRVB03 SCIREC 175IM 01072855:90 01072856:48 91-302/16:55:18 GASPRA
GAPSLTCRVB03 SCITLM 176IM 01072856:00 01072856:13 91-302/16:55:18 GASPRA
GAPSLTCRVB03 SCIREC 175IU 01072856:52 01072857:37 91-302/16:55:53 GASPRA
GAPSLTCRVB03 SCITLM 176IT 01072856:52 01072856:65 91-302/16:55:53 GASPRA
GAPNGASPER05 TARGET 165JG 01072872:04 01072874:06 91-302/17:11:32 GASPRA
GAPNGASPER05 CSMOS 117JG 01072873:83 01072874:24 91-302/17:13:25 GASPRA
GAPNGASPER05 INITRS 128JG 01072873:84 01072874:86 91-302/17:13:26 GASPRA
GAPNGASPER05 SCIREC 175JS 01072874:00 01072874:26 91-302/17:13:30 GASPRA
GAPNGASPER05 SCITLM 176JS 01072874:00 01072874:13 91-302/17:13:30 GASPRA
GAPSLTCRVB04 TARGET 165ED 01072888:89 01072891:00 91-302/17:28:39 GASPRA
GAPSLTCRVB04 INITRS 128ED 01072889:89 01072891:86 91-302/17:29:40 GASPRA
GAPSLTCRVB04 SSI 147ED 01072890:76 01072891:44 91-302/17:30:32 GASPRA
GAPSLTCRVB04 CSMOS 117ED 01072890:77 01072892:35 91-302/17:30:32 GASPRA
GAPSLTCRVB04 SCIREC 175IL 01072890:90 01072891:48 91-302/17:30:41 GASPRA
GAPSLTCRVB04 SCITLM 176IL 01072891:00 01072891:13 91-302/17:30:42 GASPRA
GAPSLTCRVB04 SCIREC 175IV 01072891:52 01072892:37 91-302/17:31:16 GASPRA
GAPSLTCRVB04 SCITLM 176IU 01072891:52 01072891:65 91-302/17:31:16 GASPRA
GAPNGASPER06 TARGET 165JH 01072907:04 01072909:06 91-302/17:46:55 GASPRA
GAPNGASPER06 CSMOS 117JH 01072908:83 01072909:24 91-302/17:48:48 GASPRA
GAPNGASPER06 INITRS 128JH 01072908:84 01072909:86 91-302/17:48:49 GASPRA
GAPNGASPER06 SCIREC 175JR 01072909:00 01072909:26 91-302/17:48:54 GASPRA
GAPNGASPER06 SCITLM 176JR 01072909:00 01072909:13 91-302/17:48:54 GASPRA
GAPSLTCRVC03 TARGET 165IE 01072921:89 01072928:00 91-302/18:02:01 GASPRA
GAPSLTCRVC03 SSI 147IE 01072925:76 01072927:89 91-302/18:05:55 GASPRA
GAPSLTCRVC03 SCIREC 175IK 01072925:90 01072928:02 91-302/18:06:04 GASPRA
GAPSLTCRVC03 SCITLM 176IK 01072926:00 01072926:13 91-302/18:06:05 GASPRA
--------------------------------------------------------------------------

Page 4-28

OAPEL         PA     PSID   SCLK1      SCLK2       SCET1          TARGET
--------------------------------------------------------------------------
GAPNGASPEC03 TARGET 165JI 01072929:56 01072930:06 91-302/18:09:44 GASPRA
GAPNGASPEC03 CSMOS 117JI 01072929:83 01072934:11 91-302/18:10:02 GASPRA
GAPNGASPEC03 INITRS 128JI 01072929:84 01072930:86 91-302/18:10:03 GASPRA
GAPNGASPEC03 SCIREC 175JI 01072930:00 01072934:13 91-302/18:10:08 GASPRA
GAPNGASPEC03 SCITLM 176JI 01072930:00 01072930:13 91-302/18:10:08 GASPRA
GAPNGASPER07 TARGET 165JJ 01072942:04 01072944:06 91-302/18:22:18 GASPRA
GAPNGASPER07 CSMOS 117JJ 01072943:83 01072944:26 91-302/18:24:12 GASPRA
GAPNGASPER07 INITRS 128JJ 01072943:84 01072944:86 91-302/18:24:12 GASPRA
GAPNGASPER07 SCIREC 175JQ 01072944:00 01072944:28 91-302/18:24:17 GASPRA
GAPNGASPER07 SCITLM 176JQ 01072944:00 01072944:13 91-302/18:24:17 GASPRA
GAPSLTCRVB05 TARGET 165EE 01072958:89 01072961:00 91-302/18:39:26 GASPRA
GAPSLTCRVB05 INITRS 128EE 01072959:89 01072961:86 91-302/18:40:26 GASPRA
GAPSLTCRVB05 SSI 147EE 01072960:76 01072961:44 91-302/18:41:18 GASPRA
GAPSLTCRVB05 CSMOS 117EE 01072960:77 01072962:32 91-302/18:41:19 GASPRA
GAPSLTCRVB05 SCIREC 175II 01072960:90 01072961:48 91-302/18:41:28 GASPRA
GAPSLTCRVB05 SCITLM 176II 01072961:00 01072961:13 91-302/18:41:28 GASPRA
GAPSLTCRVB05 SCIREC 175IW 01072961:52 01072962:34 91-302/18:42:03 GASPRA
GAPSLTCRVB05 SCITLM 176IV 01072961:52 01072961:65 91-302/18:42:03 GASPRA
GAPNGASPER08 TARGET 165JK 01072977:04 01072979:06 91-302/18:57:42 GASPRA
GAPNGASPER08 CSMOS 117JK 01072978:83 01072979:24 91-302/18:59:35 GASPRA
GAPNGASPER08 INITRS 128JK 01072978:84 01072979:86 91-302/18:59:36 GASPRA
GAPNGASPER08 SCIREC 175JP 01072979:00 01072979:28 91-302/18:59:40 GASPRA
GAPNGASPER08 SCITLM 176JP 01072979:00 01072979:13 91-302/18:59:40 GASPRA
GAPSLTCRVB06 TARGET 165EF 01072993:89 01072996:00 91-302/19:14:49 GASPRA
GAPSLTCRVB06 INITRS 128EF 01072994:89 01072996:86 91-302/19:15:50 GASPRA
GAPSLTCRVB06 SSI 147EF 01072995:76 01072996:44 91-302/19:16:42 GASPRA
GAPSLTCRVB06 CSMOS 117EF 01072995:77 01072997:35 91-302/19:16:42 GASPRA
GAPSLTCRVB06 SCIREC 175IH 01072995:90 01072996:48 91-302/19:16:51 GASPRA
GAPSLTCRVB06 SCITLM 176IH 01072996:00 01072996:13 91-302/19:16:52 GASPRA
GAPSLTCRVB06 SCIREC 175IX 01072996:52 01072997:37 91-302/19:17:26 GASPRA
GAPSLTCRVB06 SCITLM 176IW 01072996:52 01072996:65 91-302/19:17:26 GASPRA
GAPUOUTGAS01 CMDRS 157KC 01073003:00 01073028:52 91-302/19:23:56 GASPRA
GAPUOUTGAS01 TARGET 165KB 01073003:50 01073005:89 91-302/19:24:30 GASPRA
GAPUOUTGAS01 CSMOS 117KB 01073003:77 01073027:52 91-302/19:24:48 GASPRA
GAPUOUTGAS01 SCIREC 175KA 01073003:89 01073027:84 91-302/19:24:56 GASPRA
GAPUOUTGAS01 SCITLM 176KA 01073004:00 01073004:13 91-302/19:24:57 GASPRA
GAPSLTCRVC04 TARGET 165ID 01073027:89 01073033:00 91-302/19:49:12 GASPRA
GAPSLTCRVC04 SSI 147ID 01073030:76 01073032:89 91-302/19:52:05 GASPRA
GAPSLTCRVC04 SCIREC 175IG 01073030:90 01073033:02 91-302/19:52:14 GASPRA
GAPSLTCRVC04 SCITLM 176IG 01073031:00 01073031:13 91-302/19:52:15 GASPRA
GAPNGASPEC04 TARGET 165JM 01073034:56 01073035:06 91-302/19:55:54 GASPRA
GAPNGASPEC04 CSMOS 117JM 01073034:83 01073039:26 91-302/19:56:12 GASPRA
GAPNGASPEC04 INITRS 128JM 01073034:84 01073035:86 91-302/19:56:13 GASPRA
GAPNGASPEC04 SCIREC 175JH 01073035:00 01073039:28 91-302/19:56:18 GASPRA
GAPNGASPEC04 SCITLM 176JH 01073035:00 01073035:13 91-302/19:56:18 GASPRA
--------------------------------------------------------------------------

Page 4-29

OAPEL         PA     PSID    SCLK1      SCLK2       SCET1         TARGET
--------------------------------------------------------------------------
GAPNGASPER10 TARGET 165JN 01073047:04 01073049:06 91-302/20:08:28 GASPRA
GAPNGASPER10 CSMOS 117JN 01073048:83 01073049:26 91-302/20:10:22 GASPRA
GAPNGASPER10 INITRS 128JN 01073048:84 01073049:86 91-302/20:10:22 GASPRA
GAPNGASPER10 SCIREC 175JN 01073049:00 01073049:32 91-302/20:10:27 GASPRA
GAPNGASPER10 SCITLM 176JN 01073049:00 01073049:13 91-302/20:10:27 GASPRA
GAPSLTCRVB07 TARGET 165EG 01073063:89 01073066:00 91-302/20:25:36 GASPRA
GAPSLTCRVB07 INITRS 128EG 01073064:89 01073066:86 91-302/20:26:36 GASPRA
GAPSLTCRVB07 SSI 147EG 01073065:76 01073066:44 91-302/20:27:28 GASPRA
GAPSLTCRVB07 CSMOS 117EG 01073065:77 01073067:63 91-302/20:27:29 GASPRA
GAPSLTCRVB07 SCIREC 175IF 01073065:90 01073066:48 91-302/20:27:38 GASPRA
GAPSLTCRVB07 SCITLM 176IF 01073066:00 01073066:13 91-302/20:27:38 GASPRA
GAPSLTCRVB07 SCIREC 175IY 01073066:52 01073067:65 91-302/20:28:13 GASPRA
GAPSLTCRVB07 SCITLM 176IX 01073066:52 01073066:65 91-302/20:28:13 GASPRA
GAPNGASPER11 TARGET 165JO 01073082:04 01073084:06 91-302/20:43:52 GASPRA
GAPNGASPER11 CSMOS 117JO 01073083:83 01073084:30 91-302/20:45:45 GASPRA
GAPNGASPER11 INITRS 128JO 01073083:84 01073084:86 91-302/20:45:46 GASPRA
GAPNGASPER11 SCIREC 175JM 01073083:85 01073084:32 91-302/20:45:46 GASPRA
GAPNGASPER11 SCITLM 176JM 01073084:00 01073084:13 91-302/20:45:50 GASPRA
GAPSLTCRVB08 TARGET 165EH 01073098:89 01073101:00 91-302/21:00:59 GASPRA
GAPSLTCRVB08 INITRS 128EH 01073099:84 01073101:86 91-302/21:01:56 GASPRA
GAPSLTCRVB08 SSI 147EH 01073100:76 01073101:44 91-302/21:02:52 GASPRA
GAPSLTCRVB08 CSMOS 117EH 01073100:77 01073102:83 91-302/21:02:52 GASPRA
GAPSLTCRVB08 SCIREC 175IE 01073100:90 01073101:48 91-302/21:03:01 GASPRA
GAPSLTCRVB08 SCITLM 176IE 01073101:00 01073101:13 91-302/21:03:02 GASPRA
GAPSLTCRVB08 SCIREC 175IZ 01073101:52 01073102:85 91-302/21:03:36 GASPRA
GAPSLTCRVB08 SCITLM 176IY 01073101:52 01073101:65 91-302/21:03:36 GASPRA
GAPNGASPER12 TARGET 165JP 01073111:04 01073113:06 91-302/21:13:11 GASPRA
GAPNGASPER12 CSMOS 117JP 01073112:83 01073113:32 91-302/21:15:04 GASPRA
GAPNGASPER12 INITRS 128JP 01073112:84 01073113:86 91-302/21:15:05 GASPRA
GAPNGASPER12 SCIREC 175JL 01073113:00 01073113:34 91-302/21:15:10 GASPRA
GAPNGASPER12 SCITLM 176JL 01073113:00 01073113:13 91-302/21:15:10 GASPRA
GAPNGASPEC05 INITRS 128JQ 01073127:84 01073129:86 91-302/21:30:15 GASPRA
GAPNGASPEC05 TARGET 165JQ 01073128:56 01073129:06 91-302/21:30:57 GASPRA
GAPNGASPEC05 CSMOS 117JQ 01073128:83 01073133:89 91-302/21:31:15 GASPRA
GAPNGASPEC05 SCIREC 175JG 01073129:00 01073134:00 91-302/21:31:20 GASPRA
GAPNGASPEC05 SCITLM 176JG 01073129:00 01073129:13 91-302/21:31:20 GASPRA
GAPS6FILTR01 INITRS 128IA 01073132:84 01073135:86 91-302/21:35:18 GASPRA
GAPS6FILTR01 TARGET 165IA 01073134:89 01073138:78 91-302/21:37:23 GASPRA
GAPS6FILTR01 SSI 147IA 01073135:24 01073138:76 91-302/21:37:40 GASPRA
GAPS6FILTR01 SCIREC 175ID 01073135:36 01073138:82 91-302/21:37:48 GASPRA
GAPS6FILTR01 SCITLM 176ID 01073135:39 01073135:52 91-302/21:37:50 GASPRA
GAPS6FILTR01 SMOS 118IA 01073136:01 01073138:68 91-302/21:38:26 GASPRA
GAPNGASPEC06 INITRS 128JR 01073140:84 01073141:86 91-302/21:43:24 GASPRA
GAPNGASPEC06 TARGET 165JR 01073141:21 01073148:49 91-302/21:43:42 GASPRA
GAPNGASPEC06 CSMOS 117JR 01073141:48 01073148:49 91-302/21:44:00 GASPRA
GAPNGASPEC06 SCITLM 176JF 01073141:52 01073141:65 91-302/21:44:03 GASPRA
GAPNGASPEC06 SCIREC 175JF 01073141:56 01073148:51 91-302/21:44:06 GASPRA
--------------------------------------------------------------------------

Page 4-30

OAPEL         PA     PSID   SCLK1       SCLK2      SCET1          TARGET
--------------------------------------------------------------------------
GAPSTWKINS01 INITRS 128IB 01073147:90 01073149:86 91-302/21:50:32 GASPRA
GAPSTWKINS01 TARGET 165IB 01073148:50 01073151:13 91-302/21:51:06 GASPRA
GAPSTWKINS01 SSI 147IB 01073148:76 01073151:11 91-302/21:51:24 GASPRA
GAPSTWKINS01 CSMOS 117IA 01073148:77 01073151:13 91-302/21:51:24 GASPRA
GAPSTWKINS01 SCIREC 175IC 01073148:88 01073151:17 91-302/21:51:32 GASPRA
GAPSTWKINS01 SCITLM 176IC 01073149:00 01073149:13 91-302/21:51:34 GASPRA
GAPNGSCHEM02 INITRS 128JS 01073150:84 01073151:86 91-302/21:53:30 GASPRA
GAPNGSCHEM02 TARGET 165JS 01073151:39 01073157:71 91-302/21:54:01 GASPRA
GAPNGSCHEM02 SCITLM 176JE 01073151:65 01073151:78 91-302/21:54:18 GASPRA
GAPNGSCHEM02 CSMOS 117JS 01073151:66 01073157:71 91-302/21:54:19 GASPRA
GAPNGSCHEM02 SCIREC 175JE 01073151:74 01073157:73 91-302/21:54:24 GASPRA
GAPS4FILTR01 INITRS 128IC 01073155:84 01073158:86 91-302/21:58:34 GASPRA
GAPS4FILTR01 TARGET 165IC 01073157:89 01073163:52 91-302/22:00:38 GASPRA
GAPS4FILTR01 SSI 147IC 01073158:24 01073163:50 91-302/22:00:56 GASPRA
GAPS4FILTR01 SCIREC 175IB 01073158:36 01073163:56 91-302/22:01:04 GASPRA
GAPS4FILTR01 SCITLM 176IB 01073158:39 01073158:52 91-302/22:01:06 GASPRA
GAPS4FILTR01 SMOS 118IB 01073158:66 01073163:42 91-302/22:01:24 GASPRA
GAPNGSCHEM04 INITRS 128JT 01073163:84 01073164:86 91-302/22:06:39 GASPRA
GAPNGSCHEM04 TARGET 165JT 01073164:01 01073172:71 91-302/22:06:44 GASPRA
GAPNGSCHEM04 SCITLM 176JD 01073164:26 01073164:39 91-302/22:07:01 GASPRA
GAPNGSCHEM04 CSMOS 117JT 01073164:28 01073172:71 91-302/22:07:02 GASPRA
GAPNGSCHEM04 SCIREC 175JD 01073164:36 01073172:73 91-302/22:07:08 GASPRA
GAPNGASMAP01 INITRS 128JU 01073172:84 01073173:86 91-302/22:15:45 GASPRA
GAPNGASMAP01 TARGET 165JU 01073173:19 01073177:36 91-302/22:16:02 GASPRA
GAPNGASMAP01 CSMOS 117JU 01073173:46 01073177:36 91-302/22:16:20 GASPRA
GAPNGASMAP01 SCITLM 176JC 01073173:52 01073173:65 91-302/22:16:24 GASPRA
GAPNGASMAP01 SCIREC 175JC 01073173:54 01073177:38 91-302/22:16:26 GASPRA
GAPSHIPHAS01 TARGET 165EI 01073177:50 01073185:52 91-302/22:20:26 GASPRA
GAPSHIPHAS01 SSI 147EI 01073177:76 01073185:24 91-302/22:20:43 GASPRA
GAPSHIPHAS01 CSMOS 117EI 01073177:77 01073185:30 91-302/22:20:44 GASPRA
GAPSHIPHAS01 SCIREC 175IA 01073177:88 01073185:30 91-302/22:20:51 GASPRA
GAPSHIPHAS01 SCITLM 176IA 01073178:00 01073178:13 91-302/22:20:53 GASPRA
             PCINIT 190JA 01073363:88 01073379:00 91-303/01:28:55 PCT
GANNPCTCAL01 INITRS 128JV 01073369:84 01073370:86 91-303/01:34:56 PCT
GANNPCTCAL01 CMDRS 157JA 01073370:00 01073406:00 91-303/01:35:01 PCT
GANNPCTCAL01 SCITLM 176JA 01073370:00 01073370:13 91-303/01:35:01 PCT
             ALSPINSP 192JA 01073393:00 01073399:00 91-303/01:58:16 PCT
GANNPCTCAL01 SCIREC 175JA 01073398:85 01073400:01 91-303/02:04:16 PCT
GANNPCTCAL01 SCIREC 175JX 01073401:85 01073403:01 91-303/02:07:18 PCT
             PCREST 191JA 01073404:00 01073409:00 91-303/02:09:24 PCT
             RADHTR 185JA 01073406:00 01073806:01 91-303/02:11:25 RCT
GANNRCTCAL01 INITRS 128JW 01073789:84 01073790:86 91-303/08:39:36 RCT
GANNRCTCAL01 CMDRS 157JB 01073790:00 01073809:00 91-303/08:39:41 RCT
GANNRCTCAL01 SCITLM 176JB 01073790:00 01073790:13 91-303/08:39:41 RCT
             ALSPINSP 192JB 01073790:00 01073798:00 91-303/08:39:41 RCT
GANNRCTCAL01 SCIREC 175JB 01073792:85 01073794:01 91-303/08:42:39 RCT
GANNRCTCAL01 SCIREC 175JY 01073795:85 01073797:01 91-303/08:45:41 RCT
--------------------------------------------------------------------------

Pages 4-31 to 4-32

Pages contains table found in file nimsgd4-031.pdf.

Page 5-01

Chapter 5 - Detailed Observation Designs
Contents
Sub-Section                                        Page
5.0 Contents ..................................... 1
5.1 Introduction to Chapter 5 .................... 2
5.2 Gaspra Far Encounter Observations ............ 4-59
5.3 Gaspra Near Encounter Observations ........... 60-75
5.4 Gaspra Calibration Observations ...............76-78

Page 5-02

Introduction to Chapter 5

Detailed Observation Designs
Each NIMS Detailed Observation Design consists of an OAPEL form
and a Pointer plot. The OAPEL form is a brief description of the
design of the observation. The Pointer plot is a plot of the target
body with the NIMS footprint incorporated in the mosaic design superimposed
on the target body. The size and orientation of the target
body is plotted as it appears at the time of the first NIMS footprint
plotted. For long observations, the target body may rotate or move
relative to the spacecraft during the observation. Some observations,
such as calibrations, do not have Pointer plots.
The GASPEC, GASCUR and GASPER observations together provide a
meridional albedo map of Gaspra with samples every 15 degrees of
Gaspra’s rotation (corresponding to about 18 minutes between observations).
The frequency of samples in each of the 3 types of observations
is given below:
1) GASPEC - Full Map mode observations at Long Map Nyquist sampling
rates (0.03 mrad/sec) every 90 degrees of Gaspra’s rotation.
2) GASCUR - Short Map mode observations every 30 degrees of Gaspra’s
rotation when GASPEC observations are not planned.
3) GASPER - Fixed Map mopde observations every 15 degrees of Gaspra’s
rotation except when GASPEC or GASCUR observations are not
planned.

Some additional observations have been added to the original
Gaspra Nimsguide. These are observations where NIMS is riding along
behind SSI: GAPSLTCRVC01, GAPSLTCRVC02, GAPSLTCRVC03, GAPSLTCRVC04.
Since these observations were not considered as NIMS observations
during the Gaspra planning stage, the pointer plots show the footprint
of SSI and not NIMS.

Page 5-03

This page is intentionally left blank.

Page 5-04 to 5-78

Pages contains tables and figures found in file nimsgd5-04.pdf.

Page 6-01

Chapter 6 - Data Playback

Contents
Sub-Section                                        Page
6.0 Contents ..................................... 1
6.1 Introduction to Chapter 6 .................... 2-3
6.2 NIMS Obstab (Data Returned) .................. 4-5
6.3 NIMS Gaspra Data Table ....................... 6-8

Page 6-02

Introduction to Chapter 6

Data Playback

The Gaspra data were recorded on tape during the Gaspra Encounter
and played back during the Earth 2 Encounter at a high data rate. Thus,
all of the NIMS data that were recorded during the Gaspra Encounter
were returned.

The NIMS data are stored in EDRs (Experiment Data Records)
produced by JPL-MIPS (Multi-mission Image Processing System). The
NIMS EDR is described in the NIMS Experiment Data Record SIS (Software
Interface Specification) Number 232-08. This document is part of the
Galileo Project document GLL-625-610. The NIMS EDR file name is
determined by the start time (SCLK) of the data. It begins with the
letter "N", which is followed by the partition number, RIM and MOD91
counts; the file extension is a number which represents the version
number of duplicate files. For example, if the clock is in its second
cycle and the first record’s SCLK is equal to 12345678.90.7, and this
is the first such EDR, then the file will be named: "N21234567890.1".
The MIPS-generated EDRs have a Vicar label, followed by a PDS/ISIS
label, binary header records and the data records. For archiving on
CD-ROM, the Vicar labels are detached (but kept separately on the CD)
and the file is renamed so as to conform to the 8.3 DOS file-naming
convention as follows: The initial "N" becomes an "E", the partition
number is preserved, the RIM count is split between the name and the
extension, and a final character (A,B,...) is added to the extension
to distinguish any EDRs that start in the same RIM. For example, the
MIPS EDR N21234567890.1 becomes E2123456.78A.

Along with this NIMS Guide, other files are distributed on the
NIMS EDR CD to help describe the NIMS data. Among these files are the
OBSCAT, OBSPLN and RIMCAT. The OBSCAT is very similar to the OBSTAB
described below in this chapter and as well as in its PDS label on the
CD. The OBSPLN, the planned OBSTAB, is a table similar to the planned
Obstab found in Chapter 4 of this NIMS Guide. It is also described in
its PDS label on the CD. The RIMCAT is a table which describes the
NIMS EDR data on a RIM by RIM basis. It contains one entry (row) for
each RIM of each NIMS EDR. The RIMCAT may be used to track instument
mode and state changes, etc. It too is described in its PDS label on
the CD.


The table on the following two pages, the NIMS Obstab (Observation
Table), is a time-ordered listing of the NIMS observation parameters
for the data returned from the Gaspra Encounter. It will be used for
systematic processing of the EDR data into cubes and tubes. The NIMS
Obstab found in Chapter 4 of this NIMS Guide is the Planned Obstab -
the Observation Table for the NIMS data that was sent to the
spacecraft’s tape recorder. Since all of the NIMS observations were
returned, these two tables are nearly identical.

The table on the following three pages gives a brief summary of
the NIMS data returned for the Gaspra Encounter. Since Gaspra’s

Page 6-03

position and velocity were not well known during the planning stages
of the Gaspra observations, a large amount of empty space was scanned
in each mosaic to ensure that Gaspra would be observed. For each NIMS
EDR the SCLK range is given along with the OAPEL names of the NIMS
observations that take place during that time period. For each
observation the time ranges in which data were taken along with the
time ranges and mirror positions in which NIMS actually observed
Gaspra are listed. Of all of the NIMS Gaspra observations, only the
first observation failed to see Gaspra. The last four NIMS EDRs in
this table contain NIMS PCT and RCT calibration data.

Pages 6-04 to 6-08

The tables of pages 6-04 to 6-08 are in file nimsgd6-04.pdf.

Page A-01

Appendix A

Contents
Sub-Section Page
A.0 Contents ..................................... 1
A.1 Introduction to Appendix A ................... 2
A.2 Galileo NAV Team OPNAV Memo .................. 3

Page A-02

A-02
Introduction to Appendix A

This chapter contains a memo from the Galileo NAV Team regarding
the processing and analysis of the Gaspra OPNAV images. This memo
presents the results of the latest orbit determination analysis for
the LGA Gaspra Encounter. It contains a section on the methods used
to determine ’B-plane’ statistics and another section describing the
Orbit Determination Simulation. The memo was scanned on a document
scanner into postscript image format. The original JPL Interoffice
Memo is GLL-NAV-91-109 dated 22. July, 1991, To: F. T. Nicholson,
From: R. M. Vaughn, Subject: "Revised Gaspra Encounter B-Plane
Statistics for EE-2’ OPNAV Schedule".

Pages A-03 to A-08

The Galileo NAV Team OPNAV Memo is in file nimsgdA-03.pdf.